# Subaru Parts Trust Index

> Independent ratings of Subaru parts retailers and aftermarket brands. Retailers are scored on return policy, warranty support, shipping, pricing transparency, customer support and industry investment. Brands are scored on build quality, fitment accuracy, durability, support/warranty and documentation. Scores are editorial, sourced from published policies, public reviews and moderated user reports.

## Core pages
- [Methodology](https://sixstarpartsreview.com/methodology): weights, formula, evidence sources, moderation and independence policy.
- [Retailer directory](https://sixstarpartsreview.com/retailers)
- [Brand directory](https://sixstarpartsreview.com/brands)
- [Reported issues](https://sixstarpartsreview.com/issues): moderated community reports.

## Machine-readable
- [API index](https://sixstarpartsreview.com/api/public)
- [Retailers JSON](https://sixstarpartsreview.com/api/public/retailers)
- [Brands JSON](https://sixstarpartsreview.com/api/public/brands)
- [Issues JSON](https://sixstarpartsreview.com/api/public/issues)

## Retailers
- [Subimods](https://sixstarpartsreview.com/retailers/subimods): 8.5/10 — Subaru-only catalog with heavy in-house content
- [Summit Racing](https://sixstarpartsreview.com/retailers/summit-racing): 8.3/10 — Logistics leader, generalist catalog
- [Subispeed](https://sixstarpartsreview.com/retailers/subispeed): 8.2/10 — Subaru specialist with strong install media
- [MAPerformance](https://sixstarpartsreview.com/retailers/maperformance): 8.1/10 — Multi-platform with a real shop behind it
- [RallySport Direct](https://sixstarpartsreview.com/retailers/rallysport-direct): 7.9/10 — Large catalog, in-house photography
- [Extreme PSI](https://sixstarpartsreview.com/retailers/extreme-psi): 7.6/10 — Old-guard supplier with deep parts knowledge
- [Import Image Racing](https://sixstarpartsreview.com/retailers/import-image-racing): 7.6/10 — Enthusiast-run with strong build support
- [Vivid Racing](https://sixstarpartsreview.com/retailers/vivid-racing): 6.8/10 — Very broad catalog, less Subaru focus

## Brands
- [COBB Tuning](https://sixstarpartsreview.com/brands/cobb-tuning): 9.6/10 — Accessport ecosystem and staged packages
- [ACT (Advanced Clutch Technology)](https://sixstarpartsreview.com/brands/act): 9.5/10 — Clutch and flywheel packages
- [Whiteline](https://sixstarpartsreview.com/brands/whiteline): 9.5/10 — Bushings, sway bars and chassis control
- [GrimmSpeed](https://sixstarpartsreview.com/brands/grimmspeed): 9.4/10 — Engineering-forward bolt-ons
- [Tomei Powered](https://sixstarpartsreview.com/brands/tomei): 9.4/10 — JDM engineering heritage
- [IAG Performance](https://sixstarpartsreview.com/brands/iag-performance): 9.3/10 — Built short blocks and oiling solutions
- [Killer B Motorsport](https://sixstarpartsreview.com/brands/killer-b-motorsport): 9.2/10 — Oil pickups, pans and holy headers
- [PERRIN Performance](https://sixstarpartsreview.com/brands/perrin-performance): 8.8/10 — Broad Subaru bolt-on catalog
- [Mishimoto](https://sixstarpartsreview.com/brands/mishimoto): 8.7/10 — Cooling with lifetime warranty
- [Invidia](https://sixstarpartsreview.com/brands/invidia): 8.5/10 — Volume exhaust manufacturer

## Attribution
Cite as: Subaru Parts Trust Index. Scores are editorial judgements, not verified manufacturer statements.